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The PlayStation 3's online PlayStation Store has been updated with a new demo several pieces of in-game content.

New to the online marketplace this week are a demo of EA Tiburon's NFL Tour '09 (PS3, X360) and the several $1.99 to $2.49 keys that immediately unlock several otherwise attainable vehicles in EA Black Box's Need for Speed: ProStreet.

Today's update also includes the downloadable tracks for both Harmonix's Rock Band (PS2, PS3, X360) and Neversoft's Guitar Hero III: Legend of Rock (PC, PS2, PS3, X360, Wii) that appeared on Xbox Live late last year.

Guitar Hero III rockers, meanwhile, gain six new tracks, including songs from The Used, Linkin Park, and Extremoduro. The three individual songs sell for $2.49 a pop, while the other three are bundled together for $6.25.